CN115210635B

CN115210635B - Liquid crystal display panel, manufacturing method thereof and display device

Info

Publication number: CN115210635B
Application number: CN202080003757.XA
Authority: CN
Inventors: 李博文; 王菲菲; 占红明; 王凯旋; 季林涛; 马新利; 尹晓峰
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2024-04-09
Anticipated expiration: 2040-12-28
Also published as: CN115210635A; US20230221599A1; WO2022140983A1; US11868009B2

Abstract

A liquid crystal display panel (1), comprising: a first polarizing plate (11); a second polarizing plate (12) provided opposite to the first polarizing plate (11), the transmission axis of the first polarizing plate (11) being perpendicular to the transmission axis of the second polarizing plate (12); a liquid crystal layer (13) disposed between the first polarizer (11) and the second polarizer (12), wherein the liquid crystal layer (13) includes first liquid crystal molecules (133 '), and the orthographic projection of the optical axis of the first liquid crystal molecules (133') on the first polarizer (11) is parallel to the transmission axis of the first polarizer (11) or the transmission axis of the second polarizer (12); a first optical compensation layer (14) provided between the first polarizing plate (11) and the liquid crystal layer (13) or between the second polarizing plate (12) and the liquid crystal layer (13); wherein the orthographic projection of the optical axis of the first optical compensation layer (14) on the first polaroid (11) is perpendicular to the orthographic projection of the optical axis of the first liquid crystal molecules (133') on the first polaroid (11); the second optical compensation layer (15) is arranged between the first optical compensation layer (14) and the liquid crystal layer (13) or at one side of the first optical compensation layer (14) away from the liquid crystal layer (13), and the optical axis of the second optical compensation layer (15) is perpendicular to the plane where the second optical compensation layer (15) is arranged.

Description

Liquid crystal display panel, manufacturing method thereof and display device

Technical Field

The disclosure relates to the technical field of display, in particular to a liquid crystal display panel, a manufacturing method thereof and a display device.

Background

The LCD (Liquid Crystal Display ) has the characteristics of small volume, low power consumption, no radiation and the like, and is a display type which is widely applied at present.

Disclosure of Invention

In one aspect, there is provided a liquid crystal display panel including: a first polarizing plate; a second polarizing plate disposed opposite to the first polarizing plate, a transmission axis of the first polarizing plate being perpendicular to a transmission axis of the second polarizing plate; a liquid crystal layer disposed between the first polarizer and the second polarizer, wherein the liquid crystal layer includes first liquid crystal molecules, and an orthographic projection of an optical axis of the first liquid crystal molecules on the first polarizer is parallel to a transmission axis of the first polarizer or a transmission axis of the second polarizer; a first optical compensation layer disposed between the first polarizer and the liquid crystal layer or between the second polarizer and the liquid crystal layer; wherein the orthographic projection of the optical axis of the first optical compensation layer on the first polaroid is perpendicular to the orthographic projection of the optical axis of the first liquid crystal molecule on the first polaroid; the second optical compensation layer is arranged between the first optical compensation layer and the liquid crystal layer or at one side of the first optical compensation layer far away from the liquid crystal layer, and the optical axis of the second optical compensation layer is perpendicular to the plane where the second optical compensation layer is positioned.

In some embodiments, the first optical compensation layer is a +a compensation film layer.

In some embodiments, the phase retardation of the first optical compensation layer ranges from 90nm to 230nm.

In some embodiments, the phase retardation of the first optical compensation layer is any one of 120nm, 123nm, 133nm, 150nm, 160nm, 175nm, 180nm, 185nm, 190nm, or 200 nm.

In some embodiments, the second optical compensation layer is a +c compensation film layer.

In some embodiments, the phase retardation of the second optical compensation layer ranges from-30 nm to-180 nm.

In some embodiments, the phase retardation of the second optical compensation layer is any of-60 nm, -64nm, -75nm, -100nm, -110nm, -125nm, -135nm, or-150 nm.

In some embodiments, the first optical compensation is a liquid crystal molecule coated optical compensation film or a stretched polymer film based optical compensation film.

In some embodiments, the second optical compensation layer is a liquid crystal molecule coated optical compensation film layer or a stretched polymer film based optical compensation film layer.

In some embodiments, the liquid crystal display panel further includes: a first substrate disposed between the first polarizer and the liquid crystal layer; a second substrate disposed between the second polarizer and the liquid crystal layer; a third optical compensation layer disposed between the first substrate and the liquid crystal layer or between the second substrate and the liquid crystal layer; the orthographic projection of the optical axis of the third optical compensation layer on the first substrate is parallel to the orthographic projection of the optical axis of the liquid crystal molecules of the liquid crystal layer on the first substrate.

In some embodiments, the first optical compensation layer is disposed on a side of the first or second substrate that is remote from the liquid crystal layer.

In some embodiments, the second optical compensation layer is disposed on a side of the first optical compensation layer remote from the liquid crystal layer; or the second optical compensation layer is arranged between the first substrate base plate and the second substrate base plate; or the second optical compensation layer is arranged between the first substrate base plate and the first optical compensation layer; or, the second optical compensation layer is disposed between the second substrate and the first optical compensation layer.

In some embodiments, the third optical compensation layer has an in-plane retardation R _O2 In-plane retardation R with the liquid crystal layer _OLC The sum is equal to a positive integer multiple of the first wavelength; wherein the first wavelength range is 535nm + -50 nm.

In some embodiments, the third optical compensation layer has an in-plane retardation R _O2 Is 160 nm-240 nm; in-plane retardation R of the liquid crystal layer _OLC Is 350 nm.+ -.25 nm.

In some embodiments, the third optical compensation layer has an in-plane retardation R _O2 Is 185nm + -25 nm; in-plane retardation R of the liquid crystal layer _OLC Is 350 nm.+ -.25 nm.

In some embodiments, the first polarizer, the first substrate, the liquid crystal layer, the third optical compensation layer, the second substrate, the first optical compensation layer, the second optical compensation layer, and the second polarizer are stacked in this order; or, the first polarizer, the first substrate, the third optical compensation layer, the liquid crystal layer, the second substrate, the first optical compensation layer, the second optical compensation layer, and the second polarizer are stacked in this order; or, the first polarizer, the first substrate, the liquid crystal layer, the second optical compensation layer, the third optical compensation layer, the second substrate, the first optical compensation layer and the second polarizer are stacked in order.

In some embodiments, the first optical compensation layer is disposed between the first and second substrate substrates.

In some embodiments, the second optical compensation layer is disposed between the first substrate base plate and the second substrate base plate; or the second optical compensation layer is arranged on one side of the first substrate or the second substrate far away from the liquid crystal layer.

In some embodiments, the first optical compensation layer has an in-plane retardation of R _O1 The in-plane retardation of the third optical compensation layer is R _O2 The in-plane retardation of the liquid crystal layer is R _OLC ，R ₁ 、R ₂ And R is _LC The following formula is satisfied: r is R _O2 -R _O1 +R _OLC =nλ; wherein n is an integer, lambda is a first wavelength, and the range of the first wavelength is 535nm plus or minus 50nm.

In some embodiments, the liquid crystal layer includes a first alignment film and a second alignment film disposed opposite to each other, and a first liquid crystal molecular layer between the first alignment film and the second alignment film; the first alignment film is configured to anchor first liquid crystal molecules close to the first alignment film in the first liquid crystal molecule layer, so that a first pretilt angle is generated by the first liquid crystal molecules close to the first alignment film; the second alignment film is configured to anchor the first liquid crystal molecules close to the second alignment film in the first liquid crystal molecule layer, so that the first liquid crystal molecules close to the second alignment film generate a second pretilt angle according to the second pretilt angle; the alignment direction of the first alignment film is the same as the alignment direction of the second alignment film; the third optical compensation layer comprises a third alignment film and a second liquid crystal molecule layer; the third alignment film is configured to anchor second liquid crystal molecules close to the third alignment film in the second liquid crystal molecule layer, so that a third pretilt angle is generated by the second liquid crystal molecules close to the third alignment film; the orthographic projection of the optical axis of the second liquid crystal molecules of the second liquid crystal molecule layer on the first substrate is parallel to the orthographic projection of the optical axis of the first liquid crystal molecules of the first liquid crystal molecule layer on the first substrate.

In some embodiments, the first pretilt is in the same direction as the second pretilt; the third pretilt angle is in the same or opposite direction as the first pretilt angle.

In some embodiments, the direction of the first pretilt is opposite to the direction of the second pretilt; the direction of the third pretilt angle is the same as the direction of the first pretilt angle, or the direction of the third pretilt angle is the same as the direction of the second pretilt angle.

In some embodiments, the first pretilt, the second pretilt, and the third pretilt are equal in magnitude.

In some embodiments, the first pretilt, the second pretilt, and the third pretilt range in magnitude from 2 ° ± 2 °.

In some embodiments, the first pretilt, the second pretilt, and the third pretilt range from 2 ° ± 1 °.

In some embodiments, the first liquid crystal molecules are negative liquid crystal molecules.

In another aspect, a display device is provided, including a liquid crystal display panel according to any one of the above embodiments; and the backlight module is arranged on one side of the first polaroid of the liquid crystal display panel, which is far away from the liquid crystal layer of the liquid crystal display panel.

In some embodiments, an orthographic projection of an optical axis of a liquid crystal layer of the liquid crystal display panel on the first polarizer is perpendicular to a transmission axis of the first polarizer; the first optical compensation layer and the second optical compensation layer of the liquid crystal display panel are respectively arranged on one side of the liquid crystal layer away from the backlight module.

In some embodiments, an orthographic projection of an optical axis of a liquid crystal layer of the liquid crystal display panel on the first polarizer is parallel to a transmission axis of the first polarizer; the first optical compensation layer and the second optical compensation layer of the liquid crystal display panel are respectively arranged on one side of the liquid crystal layer, which is close to the backlight module.

In still another aspect, a method for manufacturing a liquid crystal display panel is provided, including: providing a first polarizer and a second polarizer, wherein the transmission axis of the first polarizer is perpendicular to the transmission axis of the second polarizer; forming a liquid crystal layer between the first and second polarizers; the liquid crystal layer comprises first liquid crystal molecules, and the orthographic projection of the optical axis of the first liquid crystal molecules on the first polaroid is parallel to the transmission axis of the first polaroid or the transmission axis of the second polaroid; forming a first optical compensation layer between the first polarizing plate and the liquid crystal layer or between the second polarizing plate and the liquid crystal layer; wherein the orthographic projection of the optical axis of the first optical compensation layer on the first polaroid is perpendicular to the orthographic projection of the optical axis of the first liquid crystal molecule on the first polaroid; forming a second optical compensation layer between the first optical compensation layer and the liquid crystal layer or on one side of the first optical compensation layer away from the liquid crystal layer; wherein, the optical axis of the second optical compensation layer is perpendicular to the plane of the second optical compensation layer.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure, the drawings that need to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings may be obtained according to these drawings to those of ordinary skill in the art. Furthermore, the drawings in the following description may be regarded as schematic diagrams, not limiting the actual size of the products, the actual flow of the methods, the actual timing of the signals, etc. according to the embodiments of the present disclosure.

FIG. 1 is a block diagram of a display device according to some embodiments;

FIG. 2A is a block diagram of a liquid crystal display panel according to some embodiments;

FIG. 2B is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 2C is a block diagram of yet another liquid crystal display panel according to some embodiments;

fig. 3A is a schematic structural view of a liquid crystal display panel according to the related art;

FIG. 3B is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 4A is a diagram of the locations of the transmission axis of the first polarizer and the transmission axis of the second polarizer in a Pond's sphere graph at a side view angle in accordance with some embodiments;

FIG. 4B is a diagram of the polarization state of a light ray passing through layers in a liquid crystal display panel in accordance with some embodiments in a Pond's sphere graph;

FIG. 4C is a diagram of a side view angle ray in a Pond's sphere graph after passing through a first polarizer and before reaching a second polarizer, according to some embodiments;

fig. 5 is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6A is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6B is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6C is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6D is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6E is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6F is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6G is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6H is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6I is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6J is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6K is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6L is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6M is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6N is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6O is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 6P is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 7A is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 7B is a block diagram of yet another liquid crystal display panel according to some embodiments;

FIG. 8A is a perspective view of a first liquid crystal molecule and a second liquid crystal molecule distribution state according to some embodiments;

fig. 8B is a block diagram of a first alignment film (second alignment film or third alignment film) according to some embodiments;

fig. 8C is a block diagram of a third alignment film according to some embodiments;

FIG. 8D is a cross-sectional view of a first alignment film according to some embodiments;

FIG. 8E is a cross-sectional view of a second alignment film according to some embodiments;

FIG. 8F is a cross-sectional view of a third alignment film according to some embodiments;

Fig. 9 is a flowchart of a method for fabricating a liquid crystal display panel according to some embodiments.

Detailed Description

The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by one of ordinary skill in the art based on the embodiments provided by the present disclosure are within the scope of the present disclosure.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and its other forms such as the third person referring to the singular form "comprise" and the present word "comprising" are to be construed as open, inclusive meaning, i.e. as "comprising, but not limited to. In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", "some examples", "and the like are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.

As used herein, the term "if" is optionally interpreted to mean "when … …" or "at … …" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if determined … …" or "if detected [ stated condition or event ]" is optionally interpreted to mean "upon determining … …" or "in response to determining … …" or "upon detecting [ stated condition or event ]" or "in response to detecting [ stated condition or event ]" depending on the context.

The use of "adapted" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

In addition, the use of "based on" is intended to be open and inclusive in that a process, step, calculation, or other action "based on" one or more of the stated conditions or values may be based on additional conditions or beyond the stated values in practice.

As used herein, "parallel", "perpendicular", "equal" includes the stated case as well as the case that approximates the stated case, the range of which is within an acceptable deviation range as determined by one of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system). For example, "parallel" includes absolute parallel and approximately parallel, where the acceptable deviation range for approximately parallel may be, for example, a deviation within 5 °; "vertical" includes absolute vertical and near vertical, where the acceptable deviation range for near vertical may also be deviations within 5 °, for example. "equal" includes absolute equal and approximately equal, where the difference between the two, which may be equal, for example, is less than or equal to 5% of either of them within an acceptable deviation of approximately equal.

Exemplary embodiments are described herein with reference to cross-sectional and/or plan views as idealized exemplary figures. In the drawings, the thickness of layers and regions are exaggerated for clarity. Thus, variations from the shape of the drawings due to, for example, manufacturing techniques and/or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of example embodiments.

In addition, the liquid crystal display panels in the exemplary drawings shown herein are all in a state when no voltage is applied. It will be appreciated that upon application of a voltage to the liquid crystal display panel, at least some of the liquid crystal molecules in the liquid crystal display panel will deflect, thereby achieving a picture display function.

Referring to fig. 1, some embodiments of the present disclosure provide a display device 100, which display device 100 may be, for example, a display device 100 using an ADS (Advanced Super Dimension Switch, advanced super-dimensional field switching) mode.

By way of example, the display device 100 may be any device that displays images, whether in motion (e.g., video) or stationary (e.g., still image), and whether textual or pictorial. The display device 100 may be a variety of display devices 100, the variety of display devices 100 including, but not limited to, mobile phones, wireless devices, personal data assistants (Portable Android Device, PAD), handheld or portable computers, GPS (Global Positioning System ) receivers/navigators, cameras, MP4 (MPEG-4 part 14) video players, video cameras, game consoles, flat panel displays, computer monitors, automotive displays (e.g., automobile drive recorder or reverse image, etc.), and the like.

With continued reference to fig. 1, the display device 100 may include, for example, a liquid crystal display panel 1 and a backlight module 2, wherein the backlight module 2 may provide a light source for display to the liquid crystal display panel 1.

Referring to fig. 2A to 2C, some embodiments of the present disclosure provide a liquid crystal display panel 1, the liquid crystal display panel 1 including a first polarizer 11, a second polarizer 12 disposed opposite to the first polarizer 11, and a liquid crystal layer 13 disposed between the first polarizer 11 and the second polarizer 12. Wherein the transmission axis of the first polarizer 11 is perpendicular to the transmission axis of the second polarizer 12.

The positions of the first polarizer 11 and the second polarizer 12 are determined according to the actual needs, and the present disclosure is not limited thereto. For ease of illustration, it is provided in some embodiments of the present disclosure that the first polarizer 11 is located on a side of the liquid crystal display panel 1 facing the backlight module, and the second polarizer 12 is located on a side of the liquid crystal display panel 1 facing away from the backlight module. In addition, the first polarizer 11 is configured to linearly polarize the light emitted from the backlight unit 2, and the second polarizer 12 is configured to prevent the light having a polarization direction perpendicular to the transmission axis of the second polarizer 12 from being emitted.

The liquid crystal layer 13 includes first liquid crystal molecules 133', and the orthographic projection of the optical axis of the first liquid crystal molecules 133' on the first polarizer 11 is parallel to the transmission axis of the first polarizer 11 or the transmission axis of the second polarizer 12. That is, in some embodiments, the orthographic projection of the optical axis of the first liquid crystal molecule 133' on the first polarizer 11 is parallel to the transmission axis of the first polarizer 11; accordingly, the orthographic projection of the optical axis of the first liquid crystal molecule 133' on the first polarizer 11 is perpendicular to the transmission axis of the second polarizer 12. In other embodiments, the orthographic projection of the optical axis of the first liquid crystal molecule 133' on the first polarizer 11 is parallel to the transmission axis of the second polarizer 12; accordingly, the orthographic projection of the optical axis of the first liquid crystal molecule 133' on the first polarizer 11 is perpendicular to the transmission axis of the first polarizer 11.

With continued reference to fig. 2A to 2C, the liquid crystal display panel 1 further includes a first optical compensation layer 14 and a second optical compensation layer 15.

The orthographic projection of the optical axis of the first optical compensation layer 14 on the first polarizer 11 is perpendicular to the orthographic projection of the optical axis of the first liquid crystal molecules 133' of the liquid crystal layer 13 on the first polarizer 11. Wherein the first optical compensation layer 14 is disposed between the second polarizer 12 and the liquid crystal layer 13 (as shown in fig. 2A and 2B); alternatively, the first optical compensation layer 14 is disposed between the first polarizer 11 and the liquid crystal layer 13 (as shown in fig. 2C).

The optical axis of the second optical compensation layer 15 is perpendicular to the plane of the second optical compensation layer 15. Wherein the second optical compensation layer 15 is disposed between the first optical compensation layer 14 and the liquid crystal layer 13 (as shown in fig. 2B); alternatively, the second optical compensation layer 15 is disposed on a side of the first optical compensation layer 14 away from the liquid crystal layer 13 (as shown in fig. 2A and 2C).

The optical axis (for example, the optical axis of the first optical compensation layer 14, the optical axis of the second optical compensation layer 15, and the optical axis of the first liquid crystal molecule 133') is also called an optical axis, and when light propagates in a crystal, the direction in which two orthogonal wavefront speeds are equal is the extending direction of the optical axis, and the light in this direction has no change in optical characteristics. For example, an anisotropic crystal has a birefringent effect on light propagating therein, but when light propagates therein along the optical axis of the anisotropic crystal, the light does not undergo birefringence. Thus, the optical axis of an anisotropic crystal can also be defined as the direction in which light can propagate without birefringence.

In addition, the anisotropic crystal can be further classified into a single-axis crystal having only one optical axis and a double-axis crystal having two optical axes.

The liquid crystal molecules belong to a single optical axis crystal, having only one optical axis. The liquid crystal molecules may be classified into rod-type liquid crystal molecules and discotic liquid crystal molecules according to their shapes. In the rod-like liquid crystal molecules, the long axis thereof is the optical axis; in discotic liquid crystal molecules, the minor axis thereof is the optical axis. In some embodiments, the first liquid crystal molecules 133' in the liquid crystal layer 13 are all rod-shaped liquid crystal molecules.

In some embodiments, the liquid crystal layer 13 includes a first alignment film 131 and a second alignment film 132 disposed opposite to each other, and a first liquid crystal molecular layer 133 between the first alignment film 131 and the second alignment film 132. The first liquid crystal molecules 133' are located in the first liquid crystal molecule layer 133.

The first alignment film 131 is configured to anchor the first liquid crystal molecules 133 'adjacent thereto in the first liquid crystal molecule layer 133 such that the first liquid crystal molecules 133' adjacent to the first alignment film 131 generate a first pretilt angle.

The second alignment film 132 is configured to anchor the first liquid crystal molecules 133 'adjacent thereto in the first liquid crystal molecule layer 133 such that the first liquid crystal molecules 133' adjacent to the second alignment film 132 generate a second pretilt angle according to the second pretilt angle.

Wherein, the alignment direction of the first alignment film 131 is the same as the alignment direction of the second alignment film 132.

The pretilt angle may cause the liquid crystal molecules to be in a pretilt state, which means that the liquid crystal molecules near the alignment film are tilted in a specific direction with respect to a plane in which the alignment film is located. In some embodiments of the present disclosure, the long axis of the rod-shaped liquid crystal molecules intersects the plane in which the alignment film is located, and the pretilt angle refers to an angle formed between the long axis of the rod-shaped liquid crystal molecules and the alignment direction of the alignment film. The pretilt angle that the first liquid crystal molecules 133 'exhibit is an angle between the long axis of the first liquid crystal molecules 133' near the first alignment film 131 and the alignment direction of the first alignment film 131 (i.e., a first pretilt angle) and an angle between the long axis of the first liquid crystal molecules 133 'near the second alignment film 132 and the alignment direction of the second alignment film 132 (i.e., a second pretilt angle) in a state that the first liquid crystal molecules 133' exhibit when the liquid crystal display panel 1 is not energized or when the voltage between the pixel electrode and the common electrode is 0.

The first optical compensation layer 14 comprises an anisotropic crystal layer having at least one optical axis. In some embodiments, the first optical compensation layer 14 is a uniaxial optical compensation layer having only one optical axis. On this basis, the first optical compensation layer 14 is illustratively a +a compensation film layer. The +A compensation film layer satisfies n _x1 ＞n _y1 ≈n _z1 Or n _x1 ＞n _y1 ＝n _z1 Wherein n is _x1 Compensating for X within the film layer for the +A ₁ Refractive index in axial direction, n _y1 To be within the +A compensation film layer plane and X ₁ Y with axis perpendicular ₁ Refractive index in axial direction, n _z1 The refractive index in the thickness direction of the film layer is compensated for by +A. Wherein X is ₁ The axis is the optical axis of the first optical compensation layer 14. In the case of X ₁ X can also be considered in the case of a small inclination angle (e.g., an inclination angle within 5 DEG) between the axis and the +A compensation film layer ₁ The axis is located in the plane of the +A compensation film layer. It will be appreciated that at X ₁ N is n under the condition that a smaller inclination angle exists between an axis and the +A compensation film layer _y1 And n _z1 Will be different from the existing one, so n is _y1 Can be combined with n _z1 Equal or approximately equal.

The second optical compensation layer 15 also comprises an anisotropic crystal layer having at least one optical axis. In some embodiments, the second optical compensation layer 15 is a uniaxial optical compensation layer having only one optical axis. On this basis, the second optical compensation layer 15 is illustratively a +c compensation film layer. The +C compensation film layer satisfies n _z2 ＞n _x2 ＝n _y2 Wherein n is _z2 For refractive index in the +C compensation film layer thickness direction, n _x2 Compensating for X within the film layer for the +C ₂ Refractive index in axial direction, n _y2 Compensating the film in-plane and X for the +C ₂ Y with axis perpendicular ₂ Refractive index in the axial direction.

Referring to fig. 3A, in the related art lcd panel 01, there is a problem of light leakage in the L0 state, where the L0 state refers to a state where the lcd panel 01 is in a dark state without voltage applied, and the backlight module normally provides a light source. In one aspect, the liquid crystal display panel 01 includes a first polarizer 11 and a second polarizer 12, the first polarizer 11 is located on a side of the liquid crystal display panel 01 facing the backlight module, the second polarizer 12 is located on a side of the liquid crystal display panel 01 facing away from the backlight module, and a transmission axis of the first polarizer 11 is perpendicular to a transmission axis of the second polarizer 12. The first polarizing plate 11 is configured to linearly polarize light emitted from the backlight unit 2, and the second polarizing plate 12 is configured to prevent light perpendicular to the transmission axis thereof from being emitted. The transmission axes of the first polarizer 11 and the second polarizer 12 are orthogonal to each other in the normal direction of the light exit surface of the liquid crystal display panel 01. However, the transmission axes of the first polarizer 11 and the second polarizer 12 are non-orthogonal in terms of the direction (side view angle) away from the normal to the light-emitting surface of the liquid crystal display panel 01.

Thus, polarized light entering the second polarizer 12 in an oblique direction is not orthogonal to the second polarizer 12, and is emitted through the second polarizer 12, resulting in a side view light leakage phenomenon. For example, FIG. 4A shows a position of the transmission axes of the first and second polarizers on the Ponga ball at a side view angle, where O ₁ O is a transmission axis position of the first polarizer 11 at a side view angle ₂ For the transmission axis position of the second polarizer 12 at the side view angle, it is apparent that O ₂ With O ₁ The connection line between the two is not passed through the center of the bonding ball, so O ₂ With O ₁ Is not vertical, and thus side view light leakage phenomenon occurs.

On the other hand, since the liquid crystal layer 13 is an anisotropic fluid having both fluidity and crystal birefringence, the visible morphology of the liquid crystal molecules is different at different viewing angles, and the intensity of the observed transmitted light is also different, exhibiting an optical anisotropy phenomenon. The smaller the viewing angle, the smaller the optical anisotropy; conversely, the larger the viewing angle, the larger the optical anisotropy. Referring to fig. 3A and 4B, linearly polarized light O exiting from the first polarizing plate 17 and entering the liquid crystal layer 13 at a side view angle ₁₀ Due to the incident direction and the liquid crystalThe optical axis of the molecule forms an included angle, and the linearly polarized light can generate double refraction phenomenon to deflect into elliptically polarized light O ₂₀ So that a side view light leakage phenomenon can be generated through the second polarizing plate 12. The side view light leakage phenomenon is not obvious in the bright state, but is more prominent in the dark state (L0 state). And, the side view angle light leakage phenomenon in the dark state is significantly related to the viewing angle, and the larger the viewing angle is, the more serious the light leakage phenomenon is.

In addition, the liquid crystal display panel 01 of the related art has a color shift problem. Each sub-pixel of the liquid crystal display panel is composed of three sub-pixels of red, green and blue, and different colors are presented by changing the light intensities of the three colors of red, green and blue. Because the liquid crystal molecules are birefringent materials, when light enters the inclined liquid crystal molecules, birefringence (two light components of a long axis and a short axis) occurs, so that delta n is different when the light is observed at different positions, and the transmittance of light in different wavebands is further different, so that the transmission spectrum of red, green and blue three-color light at different visual angles is changed, and finally the intensity of the three-color light at different visual angles is changed. According to the intensity of red, green and blue three-color light which is designed according to the forward viewing angle (namely, the normal direction of the light emitting surface of the liquid crystal display panel), the deviation is inevitably generated under the side viewing angle, and the color deviation naturally exists after the three-color light is compounded, so that the liquid crystal display panel has the problem of side viewing role deviation.

For example, see FIG. 4B, in elliptically polarized light O ₂₀ Blue light component (O) _B2 ) Specific red light component (O) _R2 ) More nearly linearly polarized light, red light component (O _R2 ) Specific green light component (O) _G2 ) More nearly linearly polarized light. Thus, the red and green light more easily passes through the second polarizer 12, and the red and green light in the leaked light has more components, and the phenomenon of yellow polarization appears, which is easily perceived by human eyes. Here, Δn is the refractive index n of the extraordinary ray ₀ Refractive index n with ordinary ray _e Wherein the ordinary ray is a ray that obeys the law of refraction and the extraordinary ray is a ray that does not obey the law of refraction. For positive liquid crystal molecules, the refractive index n of the ordinary ray is n no matter in which direction the ray propagates ₀ All correspond to the short axis of the liquid crystal molecules, and thus the refraction of ordinary lightRate n ₀ Is unchanged; refractive index n of extraordinary ray _e And the direction of the optical axis of the corresponding liquid crystal molecules changes along with the traveling direction of the light rays.

Accordingly, the liquid crystal display panel 01 in the related art has an L0 light leakage problem and a color shift problem.

Referring to fig. 3B, 4B and 4C, in the L0 state of the liquid crystal display panel 1 of some embodiments of the present disclosure, the first optical compensation layer 14 and the second optical compensation layer 15 change the polarization state of polarized light passing therethrough along a side view angle by compensating for the phase retardation of the polarized light, on the one hand, counteracting the phase retardation effect of the liquid crystal layer 13, and returning the polarized light to the state of linearly polarized light when entering the second polarizing plate 12 along the side view angle, and on the other hand, rotating the linearly polarized light to be perpendicular to the transmission axis of the second polarizing plate 12. Referring to fig. 4C, linearly polarized light O exiting from the first polarizing plate 11 and entering the liquid crystal layer 13 at a side view angle ₁₀ After passing through the liquid crystal layer 13, the first optical compensation layer 14 and the second optical compensation layer 15, the polarizing plate is deflected to a light transmission axis O at a side view angle with the second polarizing plate 12 ₂ Perpendicular linearly polarized light O ₁₀ ' cannot pass through the second polarizing plate 12. Thus, most of the light entering the second polarizer 12 along the side view angle cannot exit from the second polarizer 12, so that the side view angle light leakage problem is effectively reduced. Meanwhile, referring to fig. 4B, the first optical compensation layer 14 and the second optical compensation layer 15 can counteract the phase retardation caused by the liquid crystal layer 13, so that the transmission spectrum variation of red, green and blue trichromatic light at different viewing angles can be reduced, and further the intensity variation of trichromatic light at different viewing angles can be reduced, thereby reducing the color deviation after trichromatic light is compounded at the side viewing angles, and solving the color deviation problem.

In the L0 state, color shift is a phenomenon that occurs when the liquid crystal display panel is viewed from any side (side view angle) of the liquid crystal display panel, and is also substantially caused by light leakage. Therefore, the liquid crystal display panel 1 provided in some embodiments of the present disclosure may reduce the light leakage luminance and simultaneously reduce the luminance corresponding to the color shift, thereby improving the display effect of the liquid crystal display panel 1.

In some embodiments of the present invention, in some embodiments,in-plane retardation R of the first optical compensation layer 14 _O1 The range of (2) is 90nm to 230nm. In some examples, the in-plane retardation R of the first optical compensation layer 14 _O1 The range of (2) is 120nm to 200nm. In some examples, the in-plane retardation of the first optical compensation layer 14 is R _O1 The range of (2) is 150nm to 185nm. Exemplary in-plane retardation R of the first optical compensation layer 14 _O1 Is any one of 120nm, 123nm, 133nm, 150nm, 160nm, 175nm, 180nm, 185nm, 190nm or 200nm. Here, R is _O1 ＝(n _x1 -n _y1 )×d ₁ Wherein n is _x1 For X in the plane of the first optical compensation layer 14 ₁ Refractive index in axial direction, n _y1 To be in the plane of the first optical compensation layer 14 and X ₁ Y with axis perpendicular ₁ Refractive index in axial direction, d ₁ Is the thickness of the first optical compensation layer 14. R is as follows _O1 For the in-plane retardation of the first optical compensation layer 14, it can be understood as the actual retardation when light passes through the first optical compensation layer 14 in the normal direction (vertical direction).

In some embodiments, the thickness direction retardation R of the second optical compensation layer 15 _th In the range of-30 nm to-180 nm. In some examples, the thickness direction retardation R of the second optical compensation layer 15 _th In the range of-75 nm to-150 nm. In some examples, the thickness direction retardation R of the second optical compensation layer 15 _th In the range of-100 nm to-125 nm. Exemplary, the thickness direction retardation R of the second optical compensation layer 15 _th Is any one of-60 nm, -64nm, -75nm, -100nm, -110nm, -125nm, -135nm or-150 nm. Here, R is _th ＝[(n _x2 +n _y2 )/2-n _z2 ]×d ₂ Wherein n is _x2 For X in the plane of the second optical compensation layer 15 ₂ Refractive index in axial direction, n _y2 To be in plane with X in the second optical compensation layer 15 ₂ Y with axis perpendicular ₂ Refractive index in axial direction, n _z2 D is the refractive index in the thickness direction of the second optical compensation layer 15 ₂ Is the thickness of the second optical compensation layer 15.

By controlling the in-plane retardation R of the first optical compensation layer 14 _O1 And a second optical compensation layer 15 thickness direction retardation R _th On the one hand, the required compensation effect can be obtained, so that polarized light entering the second polaroid 12 along the side view angle is ensured to be linearly polarized light perpendicular to the transmission axis of the second polaroid 12, and side view angle light leakage is reduced; on the other hand, the phase retardation of the red-green light can be controlled with emphasis on ensuring that the red-green light incident on the second polarizer 12 at the side view angle is linearly polarized light perpendicular to the transmission axis of the second polarizer 12, so that most of the red-green light incident on the second polarizer 12 at the side view angle cannot pass through the second polarizer 12 to reduce the transmittance of the red-green light, and thus the light leakage appears as bluish violet when viewed from the side view angle, and the color yellowing effect is reduced.

Referring to fig. 3B and 4B, linearly polarized light O emitted from the first polarizing plate 11 ₁₀ After passing through the liquid crystal layer 13, is deflected into elliptically polarized light O ₂₀ ，O ₂₀ The blue light component (O) _B2 ) Specific red light component (O) _R2 ) More nearly linearly polarized light, red light component (O _R2 ) Specific green light component (O) _G2 ) Closer to linearly polarized light, the light leakage is biased to yellow and the phenomenon of yellowing appears. O (O) ₂₀ After passing through the first optical compensation layer 14, is deflected into elliptically polarized light O ₃₀ ，O ₃₀ Deflected into linearly polarized light O after passing through the second optical compensation layer 15 ₄₀ . In-line polarized light O ₄₀ In the green light component (O) _G4 ) Specific red light component (O) _R4 ) More nearly linearly polarized light, red light component (O _R4 ) Blue light component (O) _B4 ) More nearly linearly polarized light. Thus, most of the red-green light cannot be emitted from the second polarizing plate 12, and the light leakage appears as bluish violet when viewed from a side view angle, thereby reducing the influence of color shift and yellowing. Exemplary, in the liquid crystal display panel 1 corresponding to fig. 4B, the in-plane retardation R of the first optical compensation layer 14 _O1 A thickness direction retardation R of the second optical compensation layer 15 of 150nm _th Is-100 nm.

The type of the first optical compensation layer 14 is determined according to actual use requirements and/or process requirements, which is not limited by the present disclosure. In some embodiments, the first optical compensation 14 is a liquid crystal molecule-based coated optical compensation film. While in other embodiments the first optical compensation layer 14 is an optical compensation film layer based on a stretched polymer film.

The type of the second optical compensation layer 15 is determined according to actual use requirements and/or process requirements, which is not limited by the present disclosure. In some embodiments, the second optical compensation layer 15 is an optical compensation film layer based on a stretched polymer film. In other embodiments, the second optical compensation layer 15 is an optical compensation film layer based on liquid crystal molecule coating.

Wherein the polymer film before stretching may be prepared by solution casting or melt extrusion or any other film forming technique known in the art, and the polymer film before stretching may include a polystyrene film, a polynorbornene film, and the like. In some examples, the polymer film prior to stretching is a non-liquid crystal polymer film. When the first optical compensation layer 14 or the second optical compensation layer 15 is manufactured, a desired optical compensation film layer can be obtained by stretching the polymer film.

Referring to fig. 5, in some examples, the second optical compensation layer 15 includes a fourth alignment film 151 and a third liquid crystal molecule layer 152. The fourth alignment film 151 is configured to anchor the third liquid crystal molecules 152 'adjacent thereto in the second liquid crystal molecule layer 162 such that the long axes of the third liquid crystal molecules 152' adjacent to the fourth alignment film 151 are perpendicular to the plane in which the fourth alignment film 151 is located.

Referring to fig. 2A to 2C, in some embodiments, the liquid crystal display panel 1 further includes a first substrate 17 and a second substrate 18. The first substrate 17 is disposed between the first polarizer 11 and the liquid crystal layer 13, and the second substrate 18 is disposed between the second polarizer 12 and the liquid crystal layer 13. The materials of the first substrate 17 and the second substrate 18 may be the same, for example, glass, but may be different, which is not limited in this disclosure. In some examples, the first substrate 17 may be a substrate in an array substrate, and correspondingly, the second substrate 18 may be a substrate in a counter substrate (e.g., a color film substrate). In other examples, the first substrate 17 may be a substrate in a counter substrate (e.g., a color film substrate), and correspondingly, the second substrate 18 may be a substrate in an array substrate.

Referring to fig. 6A to 6N, in some embodiments, the liquid crystal display panel 1 further includes a third optical compensation layer 16. The third optical compensation layer 16 is disposed between the first substrate 17 and the liquid crystal layer 13 (as shown in fig. 6F), or the third optical compensation layer 16 is disposed between the second substrate 18 and the liquid crystal layer 13 (as shown in fig. 6C). The orthographic projection of the optical axis of the third optical compensation layer 16 on the first substrate 17 is parallel to the orthographic projection of the optical axis of the liquid crystal molecules of the liquid crystal layer 13 on the first substrate 17.

The third optical compensation layer 16 comprises an anisotropic crystal layer having at least one optical axis. In some embodiments, the third optical compensation layer 16 is a uniaxial optical compensation layer having only one optical axis. On this basis, the third optical compensation layer 16 is an exemplary +a compensation film layer. The +A compensation film layer satisfies n _x3 ＞n _y3 ≈n _z3 Or n _x3 ＞n _y3 ＝n _z3 Wherein n is _x3 Compensating for X within the film layer for the +A ₃ Refractive index in axial direction, n _y3 To be within the +A compensation film layer plane and X ₃ Y with axis perpendicular ₃ Refractive index in axial direction, n _z3 The refractive index in the thickness direction of the film layer is compensated for by +A. Wherein X is ₃ The axis is the optical axis of the third optical compensation layer 16. In the case of X ₃ X can also be considered in the case of a small inclination angle (e.g., an inclination angle within 5 DEG) between the axis and the +A compensation film layer ₃ The axis is located in the plane of the +A compensation film layer. It will be appreciated that at X ₃ N is n under the condition that a smaller inclination angle exists between an axis and the +A compensation film layer _y3 And n _z3 There will be a certain difference, taking into account the above, so n _y3 Can be combined with n _z3 Equal or approximately equal.

Referring to fig. 3A, in the related art, when the liquid crystal display panel is subjected to external pressure (e.g., a pressing force of a frame against the liquid crystal display panel, a bending force of the liquid crystal display panel during curved display, etc.) in the L0 state, the non-uniform external force may cause the first substrate 17 and the second substrate 18 to change from an isotropic medium to an optically anisotropic medium, so that polarized light passing through the first substrate 17 and the second substrate 18 is non-uniformly birefringent, and the polarization state of the polarized light is changed. The phase retardation caused by the first substrate 17 and the phase retardation caused by the second substrate 18 are equal in magnitude and opposite in direction, and can cancel each other out in the case where the liquid crystal layer 13 is not present between the first substrate 17 and the second substrate 18. In the case where the liquid crystal layer 13 is present, a phase difference occurs when the polarized light passes through the liquid crystal layer 13, and the phase delays caused by the first substrate 17 and the second substrate 18 cannot cancel each other. For example, with continued reference to fig. 3A, the first substrate 17 is provided with a first polarizer 11 on a side thereof remote from the liquid crystal layer 13, and the second substrate 18 is provided with a second polarizer 12 on a side thereof remote from the liquid crystal layer 13. The natural light emitted by the backlight module 2 will become linearly polarized light after passing through the first polarizer 11, and after passing through the first substrate 17, the liquid crystal layer 13 and the second substrate 18 in sequence, the linearly polarized light will become elliptically polarized light due to the phase retardation, and the elliptically polarized light can be emitted through the second polarizer 12, so as to generate light leakage, which is the phenomenon of pressed light leakage.

Referring to fig. 6A-6N, in some embodiments, the first optical compensation layer 14 is disposed on a side of the first or second substrate 17 or 18 remote from the liquid crystal layer 13. That is, in some examples, the first optical compensation layer 14 is disposed between the first substrate base plate 17 and the first polarizing plate 11 (as shown in fig. 6D to 6F, fig. 6G to 6J). In other examples, the first optical compensation layer 14 is disposed between the second substrate 18 and the second polarizer 12 (as shown in fig. 6A-6C, 6K-6N).

In the case where the first optical compensation layer 14 is disposed on the side of the first or second substrate 17 or 18 away from the liquid crystal layer 13 and the first optical compensation layer 14 is a +A compensation film layer, the +A compensation film layer satisfies n _x1 ＞n _y1 ＝n _z1 Wherein n is _x1 Compensating for X within the film layer for the +A ₁ Refractive index in axial direction, n _y1 To be within the +A compensation film layer plane and X ₁ Y with axis perpendicular ₁ Refractive index in axial direction, n _z1 The refractive index in the thickness direction of the film layer is compensated for by +A.

In the case where the first optical compensation layer 14 is provided on the side of the first or second substrate 17 or 18 remote from the liquid crystal layer 13, for example, the first optical compensation layer 14 may be provided as an optical compensation film layer based on a stretched polymer film. In this way, the first optical compensation layer 14 is conveniently formed outside the liquid crystal cell, thereby contributing to simplification of the process of manufacturing the liquid crystal display panel.

In the case where the first optical compensation layer 14 is provided on the side of the first or second substrate 17 or 18 away from the liquid crystal layer 13:

illustratively, the second optical compensation layer 15 may be disposed on a side of the first optical compensation layer 14 away from the liquid crystal layer 13 (as shown in fig. 6A, 6B, 6D, and 6E); alternatively, the second optical compensation layer 15 may be disposed between the first substrate 17 and the second substrate 18 (as shown in fig. 6C, 6F, 6G, 6H, 6K, and 6L); alternatively, the second optical compensation layer 15 may be disposed between the first substrate 17 and the first optical compensation layer 14 (as shown in fig. 6I and 6J); still alternatively, the second optical compensation layer 15 may be disposed between the second substrate 18 and the first optical compensation layer 14 (as shown in fig. 6M and 6N).

exemplary, in-plane retardation R of third optical compensation layer 16 _O2 In-plane retardation R with liquid crystal layer 13 _OLC The sum is equal to a positive integer multiple of the first wavelength; the first wavelength ranges from 535nm + -50 nm.

R _O2 ＝(n _x3 -n _y3 )×d ₃ Wherein n is _x3 For X in the plane of the third optical compensation layer 16 ₃ Refractive index in axial direction, n _y3 To be in the plane of the third optical compensation layer 16 and X ₃ Y with axis perpendicular ₃ Refractive index in axial direction, d ₃ Is the thickness of the third optical compensation layer 16. Wherein R is _O2 For the in-plane retardation of the third optical compensation layer 16, it can be understood as the actual retardation when light passes through the third optical compensation layer 16 in the normal direction (vertical direction).

R _OLC ＝(n _xLC -n _yLC )×d _LC Wherein n is _xLC N is the refractive index in the X-axis direction in the plane of the liquid crystal layer 13 _yLC D is the refractive index in the Y-axis direction perpendicular to the X-axis in the plane of the liquid crystal layer 13 _LC Is the thickness of the liquid crystal layer 13. Wherein the X-axis is the optical axis of the first liquid crystal molecules in the liquid crystal layer 13. Note that, when the X axis and the liquid crystal layer 13 have a small inclination angle (for example, an inclination angle of 5 ° or less), the X axis may be considered to be located in the plane of the liquid crystal layer 13. R is R _OLC The in-plane retardation of the liquid crystal layer 13 can be understood as the actual retardation when light passes through the liquid crystal layer 13 in the normal direction (vertical direction).

In this structure, the third optical compensation layer 16 performs a forward compensation function to cancel out the phase retardation of the liquid crystal layer 13 with respect to polarized light, so that the phase retardation caused by the first substrate 17 and the second substrate 18 can be canceled out, and the light emitted from the second substrate 18 is restored to a polarized state to some extent before entering the first substrate 17. For example, the linearly polarized light emitted from the first polarizing plate 11 is not changed in polarization state after passing through the first substrate 17, the third optical compensation layer 16, the liquid crystal layer 13, and the second substrate 18, and is still linearly polarized light perpendicular to the transmission axis of the second polarizing plate 12, and thus cannot be emitted from the second polarizing plate 12. Therefore, when the liquid crystal display panel 1 is pressed in the L0 state, most of the light of the backlight module 2 cannot exit from the liquid crystal display panel 1, so that the dark state pressed light leakage problem is improved.

The relative positions of the third optical compensation layer 16 and the liquid crystal layer 13 are not limited herein, and may be determined according to actual needs; for example, the linearly polarized light may pass through the third optical compensation layer 16 before passing through the liquid crystal layer 13, or may pass through the liquid crystal layer 13 before passing through the third optical compensation layer 16.

In some embodiments, the in-plane retardation R of the third optical compensation layer 16 may be made by adjusting the refractive index properties of the liquid crystal molecules of the third optical compensation layer 16 and/or the liquid crystal layer 13 and the thickness of the third optical compensation layer 16 and/or the liquid crystal layer 13 _O2 In-plane retardation R with liquid crystal layer 13 _OLC The sum is equal toA positive integer multiple of the first wavelength.

The first wavelength ranges from 535nm + -50 nm, i.e., the first wavelength has a minimum of 485nm, a maximum of 585nm, and a median of 535nm. When the sum of the phase retardation of the third optical compensation layer 16 and the phase retardation of the liquid crystal layer 13 is 535nm, not only the compressed light leakage of the front viewing angle and the side viewing angle is significantly reduced when the liquid crystal display panel 1 is in the L0 state, but also the light leakage which is displayed when the liquid crystal display panel 1 is observed from the side viewing angle is blue. Compared with red, yellow, green and other color bias colors, the color bias blue is more acceptable. Therefore, the display effect is further improved by setting the first wavelength range to 535nm + -50 nm.

In some embodiments, the in-plane retardation R of the third optical compensation layer 16 _O2 Is 160 nm-240 nm; in-plane retardation R of liquid crystal layer 13 _OLC Is 350 nm.+ -.25 nm. Exemplary, in-plane retardation R of third optical compensation layer 16 _O2 For example 160nm, 180nm, 200nm, 210nm, 220nm and 240nm. In-plane retardation R of liquid crystal layer 13 _OLC For example, 325nm, a maximum of 375nm, and a median of 350nm. In-plane retardation R of the third optical compensation layer 16 _O2 When the range of (2) is 160-240 nm, the forward compensation effect of the third optical compensation layer 16 is better, and the in-plane retardation R of the liquid crystal layer 13 is matched appropriately _OLC Therefore, a plurality of matching combinations of the third optical compensation layer 16 and the liquid crystal layer 13 can be provided, and the liquid crystal display panel 1 is finally ensured to have a better display effect.

In some embodiments, the in-plane retardation R of the third optical compensation layer 16 _O2 Is 185nm + -25 nm; in-plane retardation R of liquid crystal layer 13 _OLC Is 350 nm.+ -.25 nm. Wherein the in-plane retardation R of the third optical compensation layer 16 _O2 For example, 160nm, a maximum value of 210nm, and a median value of 185nm. In-plane retardation R of liquid crystal layer 13 _OLC For example, 325nm, a maximum of 375nm, and a median of 350nm. In-plane retardation R of the third optical compensation layer 16 _O2 When the range of (2) is 185nm + -25 nm, the forward compensation effect of the third optical compensation layer 16 is better, and the liquid crystal layer is matched appropriately13 in-plane retardation R _OLC The combination of the third optical compensation layer 16 and the liquid crystal layer 13 can also be provided, so that the liquid crystal display panel 1 is finally ensured to have better display effect.

In other embodiments, as shown in fig. 6O and 6P, the first optical compensation layer 14 is disposed between the first and second substrate substrates 17 and 18. On the basis of this, the second optical compensation layer 15 may be disposed between the first substrate base 17 and the second substrate base 18 (as shown in fig. 6O); alternatively, the second optical compensation layer 15 may be disposed on a side of the first substrate 17 away from the liquid crystal layer 13, or the second optical compensation layer 15 may be disposed on a side of the second substrate 18 away from the liquid crystal layer 13 (as shown in fig. 6P).

In the case where the first optical compensation layer 14 is disposed between the first and second substrate boards 17 and 18 and the first optical compensation layer 14 is a +a compensation film layer based on liquid crystal molecule coating, the +a compensation film layer here satisfies n _x1 ＞n _y1 ≈n _z1 Wherein n is _x1 Compensating for X within the film layer for the +A ₁ Refractive index in axial direction, n _y1 To be within the +A compensation film layer plane and X ₁ Y with axis perpendicular ₁ Refractive index in axial direction, n _z1 The refractive index in the thickness direction of the film layer is compensated for by +A. It can be understood that when the liquid crystal molecules of the first optical compensation layer 14 have pretilt angles, n _y1 And n _z1 There will be a certain difference, n, taking into account the above _y1 And n _z1 Approximately equal.

In the case where the first optical compensation layer 14 is disposed between the first substrate board 17 and the second substrate board 18, the in-plane retardation of the first optical compensation layer 14 is exemplified as R _O1 The in-plane retardation of the third optical compensation layer 16 is R _O2 The in-plane retardation of the liquid crystal layer 13 is R _OLC 。R _O1 、R _O2 And R is _OLC The following formula is satisfied:

R _O2 -R _O1 +R _OLC ＝nλ；

wherein n is an integer, lambda is a first wavelength, and the range of the first wavelength is 535nm plus or minus 50nm.

In this structure, the first optical compensation layer 14 and the third optical compensation layer 16 perform a compensation function together to cancel the phase retardation of the polarized light by the liquid crystal layer 13, so that the phase retardation caused by the first substrate 17 and the second substrate 18 can be canceled, and the light emitted from the second substrate 18 is restored to the polarized state before entering the first substrate 17 to some extent. For example, the linearly polarized light emitted from the first polarizing plate 11 is not changed in polarization state after passing through the first substrate 17, the first optical compensation layer 14, the third optical compensation layer 16, the liquid crystal layer 13, and the second substrate 18, and is still linearly polarized light perpendicular to the transmission axis of the second polarizing plate 12, and thus cannot be emitted from the second polarizing plate 12. Therefore, when the liquid crystal display panel 1 is pressed in the L0 state, most of the light of the backlight module 2 cannot exit from the liquid crystal display panel 1, so that the dark state pressed light leakage problem is improved.

When the first optical compensation layer 14, the third optical compensation layer 16, and the liquid crystal layer 13 are all located between the first substrate 17 and the second substrate 18, the relative positions of the first optical compensation layer 14, the third optical compensation layer 16, and the liquid crystal layer 13 are not limited herein, and may be determined according to actual needs.

In the case where the first optical compensation layer 14 is provided between the first substrate 17 and the second substrate 18, for example, the first optical compensation layer 14 may be provided as an optical compensation film layer based on liquid crystal molecule coating. In this way, the first optical compensation layer 14 and the liquid crystal layer 13 can be fabricated together between the first and second substrate boards 17 and 18, thereby contributing to simplification of the fabrication process of the liquid crystal display panel.

The type of the third optical compensation layer 16 is determined according to actual use requirements and/or process requirements, which is not limited by the present disclosure. In some embodiments, the third optical compensation layer 16 is a liquid crystal molecule-based coated optical compensation film layer. At this time, referring to fig. 7A, the third optical compensation layer 16 includes a third alignment film 161 and a second liquid crystal molecule layer 162. The third alignment film 161 is configured to anchor the second liquid crystal molecules 162 'adjacent thereto in the second liquid crystal molecule layer 162 such that the second liquid crystal molecules 162' adjacent to the third alignment film 161 generate a third pretilt angle. In the case where the liquid crystal layer 13 includes the first alignment film 131, the second alignment film 132, and the first liquid crystal molecule layer 133, the orthographic projection of the optical axes of the liquid crystal molecules of the second liquid crystal molecule layer 162 on the first substrate 17 is parallel to the orthographic projection of the optical axes of the liquid crystal molecules of the liquid crystal layer 13 on the first substrate 17; the alignment direction of the third alignment film 161 is the same as the alignment direction of the first alignment film 131.

In the case where the alignment direction of the third alignment film 161 is parallel to the alignment directions of the first and second alignment films 141 and 142, exemplarily, referring to fig. 8A, the first and second liquid crystal molecules 133 'and 162' are both rod-shaped liquid crystal molecules, the long axis of the second liquid crystal molecule 162 'without a pretilt angle and the long axis of the first liquid crystal molecule 133' without a pretilt angle are parallel to each other, and the layer of the first liquid crystal molecules 133 'near the second liquid crystal molecule 162' and the layer of the first liquid crystal molecules 133 'far from the second liquid crystal molecule 162' are parallel to each other. Wherein, after the other layer of the first liquid crystal molecules 133' far from the side of the second liquid crystal molecules 162' generates the first pretilt angle α, the first liquid crystal molecules 133' near to the side of the second liquid crystal molecules 162' generates the second pretilt angle β, and the second liquid crystal molecules 162' generate the third pretilt angle γ, the orthographic projection of the long axis of one layer of the second liquid crystal molecules 162' on the first polarizer 11 and the orthographic projections of the long axes of two layers of the first liquid crystal molecules 133' on the first polarizer 11 are also parallel. The first pretilt angle α is an acute angle formed between the long axis direction and the first direction of the first liquid crystal molecules 133', the second pretilt angle β is an acute angle formed between the long axis direction and the first direction of the first liquid crystal molecules 133', and the third pretilt angle γ is an acute angle formed between the long axis direction and the second direction of the second liquid crystal molecules 162 '.

It will be appreciated by those skilled in the art that since the pretilt angles of the second liquid crystal molecules 162 'and the first liquid crystal molecules 133' are smaller, the second liquid crystal molecules 162 'and the first liquid crystal molecules 133' having pretilt angles are also parallel. The second liquid crystal molecules 162 'and the first liquid crystal molecules 133' being parallel may also be understood as having the long axis direction of the second liquid crystal molecules 162 'and the long axis direction of the first liquid crystal molecules 133' being parallel.

Referring to fig. 8A, although the first pretilt angle α, the second pretilt angle β, and the third pretilt angle γ may vary in the range of 0 ° to 180 ° in the case where the alignment directions of the first, second, and third alignment films 131, 132, and 161 are determined. However, in the production, for the convenience of forming, measuring and describing the pretilt angle, only the acute angle formed between the long axis direction of the liquid crystal molecules and the alignment direction of the alignment film is referred to as the pretilt angle. The long axis direction of the liquid crystal molecules rotates around the vertex of the pretilt angle by a pretilt angle, then coincides with the alignment direction of the alignment film, and the rotation direction of the long axis direction is defined as the pretilt angle direction, and the clockwise direction is the forward direction and the anticlockwise direction is the reverse direction.

The alignment film is made of a polymer material such as Polyimide (PI). The alignment direction of the alignment films (including the first, second and third alignment films 131, 132 and 161) includes the first and second directions, and the pretilt angle is an angle formed between the long axis direction of the liquid crystal molecules (including the first and second liquid crystal molecules 133 'and 162') and the alignment direction of the alignment film by further passing through the production process of the alignment films on the basis of the alignment direction determination of the alignment films. The first direction and the second direction are perpendicular to each other, and the first direction and the second direction are parallel to a plane of the alignment film, respectively.

For example, referring to fig. 8B, when the alignment directions of the first, second, and third alignment films 131, 132, and 161 are along the first direction, an angle between the long axis direction of the first liquid crystal molecules 133' and the first direction is the first pretilt angle α or the second pretilt angle β; the angle between the long axis direction of the second liquid crystal molecules 162' and the first direction is the third pretilt angle γ.

As another example, referring to fig. 8C, when the alignment direction of the third alignment film 161 is the second direction, an angle between the long axis direction of the second liquid crystal molecules 162' and the second direction is the third pretilt angle γ.

The first alignment film 131, the second alignment film 132, and the third alignment film 161 may be formed, for example, by a Rubbing alignment process. The rubbing direction of the first, second and third alignment films 131, 132 and 161 includes information of the alignment direction and pretilt angle of the first, second and third alignment films 131, 132 and 161, i.e., the rubbing direction may determine the alignment direction and the pretilt angle direction.

As an example, referring to fig. 8D and 8E, in the process of performing the Rubbing alignment process, an upper surface (i.e., a side surface close to the first liquid crystal molecules 133 ') of the alignment film (e.g., the first alignment film 131) may form an inclined angle with respect to a lower surface (i.e., a side surface far from the first liquid crystal molecules 133') thereof. For example, as shown in fig. 8D and 8E, when rubbing from left to right, a slope inclined upward to right or downward to right is exhibited from left to right along the alignment direction of the alignment films (including the first alignment film 131 and the second alignment film 132). Although the directions of the first pretilt angle α and the second pretilt angle β are different, in practice the first alignment film 131 and the second alignment film 132 may be fabricated by the same process. In the manufacturing process, the state of the first alignment film 131 is shown with reference to fig. 8D, but in the use process, with reference to fig. 7B, since the first alignment film 131 and the second alignment film 132 are disposed opposite to each other, the directions of the first pretilt angle α and the second pretilt angle β are different, and in fact, the alignment direction of the first alignment film 131 and the rubbing direction of the second alignment film 132 are the same in the manufacturing process.

In the case where the alignment direction of the third alignment film 161 is the same as the alignment direction of the first alignment film 131 and the second alignment film 132, either left-to-right rubbing or right-to-left rubbing may be selected; when rubbing from left to right, an angle inclined to the upper right or the lower right is formed from left to right along the alignment direction of the third alignment film 161; when rubbing from right to left, an angle of inclination to the upper left (as shown in fig. 8F) or an angle of inclination to the lower left is presented from right to left along the alignment direction of the third alignment film 161. Based on this, the second liquid crystal molecules 162' adjacent to the third alignment film 161 generate a third pretilt angle γ by the third alignment film 161. Accordingly, the rubbing directions of the first, second and third alignment films 131, 132 and 161 may determine the alignment directions of the first, second and third alignment films 131, 132 and 161 and the pretilt angle directions of the liquid crystal molecules, respectively.

It is noted that each alignment direction mentioned in the present disclosure may contain 2 rubbing directions. For example, the alignment direction is the first direction, and may include rubbing from one end to the other end along the first direction (fig. 8D), or may include rubbing along a path opposite to the "from one end to the other end" (fig. 8F).

Based on the above, it will be appreciated by those skilled in the art that the rubbing direction may determine the direction of the pretilt angle, and when the alignment directions of the alignment films are the same, if the rubbing directions are different, the direction of the pretilt angle may be different. For example, when the alignment directions of the alignment films are all along the first direction, the directions of the pretilt angles generated when rubbing from left to right and rubbing from right to left are opposite.

In other embodiments, the first pretilt α is in the same direction as the second pretilt β. For example, the first pretilt angle α and the second pretilt angle β are both forward directions (see fig. 7A); alternatively, the first pretilt angle α and the second pretilt angle β are both negative. On this basis, the third pretilt angle γ is in the same direction as the first pretilt angle α. For example, when the first pretilt angle α and the second pretilt angle β are both forward, the third pretilt angle γ is also forward (see fig. 7A). For another example, when the first pretilt angle α and the second pretilt angle β are both negative, the third pretilt angle γ is also negative.

The first pretilt angle alpha, the second pretilt angle beta and the third pretilt angle gamma are in the same direction, so that the compensation effect of the third optical compensation layer 16 on the in-plane retardation of the liquid crystal layer 13 can be improved, and on one hand, most of light entering the second polaroid 12 is linearly polarized light perpendicular to the transmission axis of the second polaroid 12, so that light leakage is reduced; on the other hand, most of the red-green light can be controlled to be linearly polarized when entering the second polarizer 12, and the transmittance of the red-green light can be reduced, so that the color cast problem can be improved.

In other embodiments, the third pretilt angle γ may also be opposite to the direction of the first pretilt angle α when the direction of the first pretilt angle α is the same as the direction of the second pretilt angle β.

In still other embodiments, the first pretilt α is opposite in direction to the second pretilt β. For example, the first pretilt is positive and the second pretilt is negative; alternatively, referring to fig. 7B and 8A, the first pretilt angle α is negative and the second pretilt angle β is positive. On the basis of this, the direction of the third pretilt angle γ may be set to be the same as the direction of the first pretilt angle α, or the direction of the third pretilt angle γ may be set to be the same as the direction of the second pretilt angle β.

In some embodiments, the first pretilt α, the second pretilt β, and the third pretilt γ are equal in magnitude.

For example, the magnitudes of the first pretilt angle α, the second pretilt angle β, and the third pretilt angle γ are equal, meaning that the degrees of pretilt angle are equal in magnitude regardless of the alignment direction of the alignment films (including the first alignment film 131, the second alignment film 132, and the third alignment film 161). The magnitude of the third pretilt angle γ may be set to be equal to or substantially equal to the magnitudes of the first pretilt angle α and the second pretilt angle β, regardless of the alignment direction of the third alignment film 161 being the same as the alignment direction of the first alignment film 131 and the second alignment film 132.

When the first pretilt angle alpha, the second pretilt angle beta and the third pretilt angle gamma are equal or approximately equal, the manufacturing difficulty of each alignment film can be reduced.

In some embodiments, the first pretilt α, the second pretilt β, and the third pretilt γ range in magnitude from 2 ° ± 2 ° (i.e., 4 ° maximum, 0 ° minimum, and 2 ° median). In some examples, the first pretilt angle α, the second pretilt angle β, and the third pretilt angle γ range from 2 ° ± 1 ° (i.e., a maximum of 3 °, a minimum of 1 °, and a median of 2 °). Illustratively, the first pretilt angle α, the second pretilt angle β, and the third pretilt angle γ are all 1 °. Also, as an example, the first pretilt angle α, the second pretilt angle β, and the third pretilt angle γ are all 2 °. Also, as an example, the first pretilt angle α, the second pretilt angle β, and the third pretilt angle γ are all 3 °.

Since the degrees of the first pretilt angle α, the second pretilt angle β, and the third pretilt angle γ are each small, for example, 1 °, the long axis direction of the first liquid crystal molecules 133 'that are actually close to the first alignment film 131 and the long axis direction of the first liquid crystal molecules 133' that are close to the second alignment film 132 are substantially parallel even though the directions of the first pretilt angle α and the second pretilt angle β are different. In the case where the alignment direction of the third alignment film 161 is the same as the alignment direction of the first alignment film 131, the long axis direction of the second liquid crystal molecules 162 'is also substantially the same as the long axis direction of the first liquid crystal molecules 133'. The long axis direction of the second liquid crystal molecule 162 'is parallel to the long axis direction of the first liquid crystal molecule 133', so that the third optical compensation layer 16 can realize forward compensation for the liquid crystal layer 13, thereby improving the light leakage problem of the liquid crystal display panel 1 in the L0 state and the color cast phenomenon of the liquid crystal display panel 1.

Based on the above, the orthographic projection of the long axis of the first liquid crystal molecule 133' in the plane of the first alignment film 131 or the second alignment film 132 or the third alignment film 161 is along the first direction regardless of the magnitude of the first pretilt angle α and the second pretilt angle β. Regardless of the magnitude of the third pretilt angle γ, when the alignment direction of the third alignment film 161 is the same as the first alignment film 131 and the second alignment film 132, the orthographic projection of the long axis of the second liquid crystal molecule 162' in the plane of the first alignment film 131 or the second alignment film 132 or the third alignment film 161 is also along the first direction. Therefore, even if the first pretilt angle alpha, the second pretilt angle beta and the third pretilt angle gamma are different, the normal operation of the liquid crystal layer 13 and the third optical compensation layer 16 can be ensured, and the process requirements for manufacturing the first pretilt angle alpha, the second pretilt angle beta and the third pretilt angle gamma are reduced.

In some embodiments, the first polarizing plate 11, the second polarizing plate 12, the liquid crystal layer 13, the first optical compensation layer 14, the second optical compensation layer 15, the third optical compensation layer 16, the first substrate 17, and the second substrate 18 described above may be disposed as follows.

Mode one: as shown in fig. 6A, the first polarizing plate 11, the first substrate 17, the liquid crystal layer 13, the third optical compensation layer 16, the second substrate 18, the first optical compensation layer 14, the second optical compensation layer 15, and the second polarizing plate 12 are laminated in this order . Exemplary in-plane retardation R of the first optical compensation layer 14 _O1 In the range of 150 to 185nm, the thickness direction retardation R of the second optical compensation layer 15 _th In-plane retardation R of the third optical compensation layer 16 in the range of-100 to-125 nm _O2 185nm.

By the arrangement, the problems of side view angle light leakage, side view role bias, pressed light leakage and pressed color bias of the liquid crystal display panel with the structure in the L0 state can be remarkably improved, and the display effect is good.

Mode two: as shown in fig. 6B, the first polarizing plate 11, the first substrate 17, the third optical compensation layer 16, the liquid crystal layer 13, the second substrate 18, the first optical compensation layer 14, the second optical compensation layer 15, and the second polarizing plate 12 are stacked in this order. Exemplary in-plane retardation R of the first optical compensation layer 14 _O1 In the range of 150 to 185nm, the thickness direction retardation R of the second optical compensation layer 15 _th In-plane retardation R of the third optical compensation layer 16 in the range of-100 to-125 nm _O2 185nm.

Mode three: as shown in fig. 6C, the first polarizing plate 11, the first substrate 17, the liquid crystal layer 13, the second optical compensation layer 15, the third optical compensation layer 16, the second substrate 18, and the first and second polarizing plates 14 and 12 are stacked in this order. Exemplary in-plane retardation R of the first optical compensation layer 14 _O1 In the range of 120 to 185nm, the thickness direction retardation R of the second optical compensation layer 15 _th In-plane retardation R of the third optical compensation layer 16 in the range of-75 to-125 nm _O2 185nm.

By the arrangement, the problems of side view angle light leakage, side view role bias, pressed light leakage and pressed color bias of the liquid crystal display panel with the structure in the L0 state can be remarkably improved, and the display effect is good. In addition, as the second optical compensation layer and the third optical compensation layer are arranged on the same side of the liquid crystal layer, the balance degree in terms of process difficulty and cost is better, and the process difficulty and the cost are moderate.

Mode four: as shown in fig. 6D, in some examples, the first polarizing plate 11, the second optical compensation layer 15, the first optical compensation layer 14, the first substrate 17, the liquid crystal layer 13, the third optical compensation layer 16, the second substrate 18, and the second polarizing plate 12 are sequentially stacked. Exemplary in-plane retardation R of the first optical compensation layer 14 _O1 In the range of 150 to 185nm, the thickness direction retardation R of the second optical compensation layer 15 _th In-plane retardation R of the third optical compensation layer 16 in the range of-100 to-125 nm _O2 185nm.

By the arrangement, the problems of side view angle light leakage, side view role bias, pressed light leakage and pressed color bias of the liquid crystal display panel with the structure in the L0 state can be remarkably improved, and the display effect is good. In addition, the structure is relatively mature in technology, low in technology difficulty and easy to manufacture.

Mode five: as shown in fig. 6E, the first polarizing plate 11, the second optical compensation layer 15, the first optical compensation layer 14, the first substrate 17, the third optical compensation layer 16, the liquid crystal layer 13, the second substrate 18, and the second polarizing plate 12 are stacked in this order. Exemplary in-plane retardation R of the first optical compensation layer 14 _O1 In the range of 150 to 185nm, the thickness direction retardation R of the second optical compensation layer 15 _th In-plane retardation R of the third optical compensation layer 16 in the range of-100 to-125 nm _O2 185nm.

Mode six: as shown in fig. 6F, the first polarizing plate 11, the first optical compensation layer 14, the first substrate 17, the third optical compensation layer 16, the second optical compensation layer 15, the liquid crystal layer 13, the second substrate 18, and the second polarizing plate 12 are stacked in this order. Exemplary in-plane retardation R of the first optical compensation layer 14 _O1 In the range of 120 to 185nm, the thickness direction retardation R of the second optical compensation layer 15 _th In the range of-75 to-125 nm, in-plane retardation R of the third optical compensation layer 16 _O2 185nm.

It will be appreciated that mode one to mode six in-plane retardation R _O2 There may be a range of errors; the error range can enable the in-plane retardation R _O2 Is 185 nm.+ -.25 nm.

In some embodiments, the first liquid crystal molecules are negative liquid crystal molecules. In the L255 state, the display panel using the negative liquid crystal molecules has a high light transmittance, and thus the liquid crystal display panel 1 using the negative liquid crystal molecules has a high contrast ratio and a good display effect.

Based on the liquid crystal display panel 1 provided in some embodiments described above, referring to fig. 1, in the display device 100 provided in some embodiments of the present disclosure, the backlight module 2 is disposed on a side of the first polarizer 11 of the liquid crystal display panel 1 away from the liquid crystal layer 13.

In some embodiments, the orthographic projection of the optical axis of the liquid crystal layer 13 of the liquid crystal display panel 1 on the first polarizer 11 is perpendicular to the transmission axis of the first polarizer 11. On the basis, the first optical compensation layer 14 and the second optical compensation layer 15 of the liquid crystal display panel 1 are respectively arranged on one side of the liquid crystal layer 13 away from the backlight module 2. On this basis, as shown in fig. 6A, 6B and 6C, in some examples, the liquid crystal display panel 1 may be arranged in a one to three manner, and the problems of side view angle light leakage, side view character bias, pressed light leakage and pressed color bias in the L0 state may be significantly improved, so that the display effect is good. As shown in fig. 6G, 6H, 6I, and 6J, in other examples, the liquid crystal display panel 1 may be further provided in any of the following ways.

Mode seven: as shown in fig. 6G, the first polarizing plate 11, the first optical compensation layer 14, the first substrate 17, the second optical compensation layer 15, the third optical compensation layer 16, the liquid crystal layer 13, the second substrate 18, and the second polarizing plate 12 are stacked in this order. Here, the side view angle light leakage and side view character bias of the liquid crystal display panel having this structure in the L0 state can be significantly improved, and the display effect is good.

Mode eight: as shown in fig. 6H, the first polarizing plate 11, the first optical compensation layer 14, the first substrate 17, the second optical compensation layer 15, the liquid crystal layer 13, the third optical compensation layer 16, the second substrate 18, and the second polarizing plate 12 are stacked in this order. Here, the side view angle light leakage and side view character bias of the liquid crystal display panel having this structure in the L0 state can be significantly improved, and the display effect is good.

Mode nine: as shown in fig. 6I, the first polarizing plate 11, the first optical compensation layer 14, the second optical compensation layer 15, the first substrate 17, the liquid crystal layer 13, the third optical compensation layer 16, the second substrate 18, and the second polarizing plate 12 are stacked in this order. Here, the side view angle light leakage and side view character bias of the liquid crystal display panel having this structure in the L0 state can be significantly improved, and the display effect is good.

Mode ten: as shown in fig. 6J, the first polarizing plate 11, the first optical compensation layer 14, the second optical compensation layer 15, the first substrate 17, the third optical compensation layer 16, the liquid crystal layer 13, the second substrate 18, and the second polarizing plate 12 are stacked in this order. Here, the side view angle light leakage and side view character bias of the liquid crystal display panel having this structure in the L0 state can be significantly improved, and the display effect is good.

In other embodiments, the orthographic projection of the optical axis of the liquid crystal layer 13 of the liquid crystal display panel 1 on the first polarizer 11 is parallel to the transmission axis of the first polarizer 11. On the basis, the first optical compensation layer 14 and the second optical compensation layer 15 of the liquid crystal display panel 1 are respectively arranged at one side of the liquid crystal layer 13 close to the backlight module 2. On this basis, as shown in fig. 6D, 6E and 6F, in some examples, the liquid crystal display panel 1 may be disposed in four to six modes, and the problems of side view angle light leakage, side view character bias, pressed light leakage and pressed color bias in the L0 state may be significantly improved, and the display effect may be good. As shown in fig. 6K, 6L, 6M, and 6N, in other examples, the liquid crystal display panel 1 may be further provided in any of the following ways.

Mode eleven: as shown in fig. 6K, the first polarizing plate 11, the first substrate 17, the liquid crystal layer 13, the third optical compensation layer 16, the second optical compensation layer 15, the second substrate 18, the first optical compensation layer 14, and the second polarizing plate 12 are stacked in this order. Here, the side view angle light leakage and side view character bias of the liquid crystal display panel having this structure in the L0 state can be significantly improved, and the display effect is good.

Twelve ways: as shown in fig. 6L, the first polarizing plate 11, the first substrate 17, the third optical compensation layer 16, the liquid crystal layer 13, the second optical compensation layer 15, the second substrate 18, the first optical compensation layer 14, and the second polarizing plate 12 are stacked in this order. Here, the side view angle light leakage and side view character bias of the liquid crystal display panel having this structure in the L0 state can be significantly improved, and the display effect is good.

Thirteen modes: as shown in fig. 6M, the first polarizing plate 11, the first substrate 17, the third optical compensation layer 16, the liquid crystal layer 13, the second substrate 18, the second optical compensation layer 15, the first optical compensation layer 14, and the second polarizing plate 12 are stacked in this order. Here, the side view angle light leakage and side view character bias of the liquid crystal display panel having this structure in the L0 state can be significantly improved, and the display effect is good.

Mode fourteen: as shown in fig. 6N, the first polarizing plate 11, the first substrate 17, the liquid crystal layer 13, the third optical compensation layer 16, the second substrate 18, the second optical compensation layer 15, the first optical compensation layer 14, and the second polarizing plate 12 are stacked in this order. Here, the side view angle light leakage and side view character bias of the liquid crystal display panel having this structure in the L0 state can be significantly improved, and the display effect is good.

In any of the above embodiments, at least one of the first polarizing plate 11 and the second polarizing plate 12 has a single-layer structure or a multi-layer structure. In some examples, the multilayer polarizer includes at least one film layer having a transmission axis, and the polarization direction of light transmitted through the film layer is parallel to the transmission axis.

Referring to fig. 9, some embodiments of the present disclosure provide a method for manufacturing a liquid crystal display panel 1, including:

s1: a first polarizing plate 11 and a second polarizing plate 12 are provided, and the transmission axis of the first polarizing plate 11 is perpendicular to the transmission axis of the second polarizing plate 12.

S2: a liquid crystal layer 13 is formed between the first polarizing plate 11 and the second polarizing plate 12. Here, the liquid crystal layer 13 includes the first liquid crystal molecules 133', and the orthographic projection of the optical axis of the first liquid crystal molecules 133' on the first polarizing plate 11 is parallel to the transmission axis of the first polarizing plate 11 or the transmission axis of the second polarizing plate 12.

S3: the first optical compensation layer 14 is formed between the first polarizer 11 and the liquid crystal layer 13 or between the second substrate 18 and the liquid crystal layer 13. Here, the orthographic projection of the optical axis of the first optical compensation layer 14 on the first polarizer 11 is perpendicular to the orthographic projection of the long axes of the liquid crystal molecules of the liquid crystal layer 13 on the first polarizer 11.

S4: a second optical compensation layer 15 is formed between the first optical compensation layer 14 and the liquid crystal layer 13 or on a side of the first optical compensation layer 14 away from the liquid crystal layer 13. Here, the optical axis of the second optical compensation layer 15 is perpendicular to the plane in which the second optical compensation layer 15 is located.

By utilizing the manufacturing method, the liquid crystal display panel in the embodiments of the disclosure can be manufactured, and the problems of side view angle light leakage, side view character bias, pressed light leakage, pressed color bias and the like in the L0 state can be remarkably improved.

The foregoing is merely a specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art who is skilled in the art will recognize that changes or substitutions are within the technical scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A liquid crystal display panel, comprising:

a first polarizing plate;

a second polarizing plate disposed opposite to the first polarizing plate, a transmission axis of the first polarizing plate being perpendicular to a transmission axis of the second polarizing plate;

a liquid crystal layer disposed between the first polarizer and the second polarizer, wherein the liquid crystal layer includes first liquid crystal molecules, and an orthographic projection of an optical axis of the first liquid crystal molecules on the first polarizer is parallel to a transmission axis of the first polarizer or a transmission axis of the second polarizer;

a first optical compensation layer disposed between the first polarizer and the liquid crystal layer or between the second polarizer and the liquid crystal layer; wherein the orthographic projection of the optical axis of the first optical compensation layer on the first polaroid is perpendicular to the orthographic projection of the optical axis of the first liquid crystal molecule on the first polaroid;

the second optical compensation layer is arranged between the first optical compensation layer and the liquid crystal layer or at one side of the first optical compensation layer far away from the liquid crystal layer, and the optical axis of the second optical compensation layer is perpendicular to the plane where the second optical compensation layer is positioned;

a first substrate disposed between the first polarizer and the liquid crystal layer;

A second substrate disposed between the second polarizer and the liquid crystal layer;

a third optical compensation layer disposed between the first substrate and the liquid crystal layer or between the second substrate and the liquid crystal layer;

the orthographic projection of the optical axis of the third optical compensation layer on the first substrate is parallel to the orthographic projection of the optical axis of the liquid crystal molecules of the liquid crystal layer on the first substrate;

wherein the first optical compensation layer is arranged between the first substrate base plate and the second substrate base plate;

the in-plane retardation of the first optical compensation layer is R _O1 The in-plane retardation of the third optical compensation layer is R _O2 The in-plane retardation of the liquid crystal layer is R _OLC ，R _O1 、R _O2 And R is _OLC Meets the following requirementsThe following formula:

R _O2 －R _O1 +R _OLC ＝nλ；

2. The liquid crystal display panel of claim 1, wherein the first optical compensation layer is a +a compensation film layer.

3. The liquid crystal display panel of claim 1, wherein the first optical compensation layer has an in-plane retardation R _O1 The range of (2) is 90-230 nm.

4. The liquid crystal display panel of claim 1, wherein the first optical compensation layer has an in-plane retardation R _O1 Is any one of 120nm, 123nm, 133nm, 150nm, 160nm, 175nm, 180nm, 185nm, 190nm or 200 nm.

5. The liquid crystal display panel of claim 1, wherein the second optical compensation layer is a +c compensation film layer.

6. The liquid crystal display panel according to claim 1, wherein the second optical compensation layer has a thickness direction retardation R _th In the range of-30 nm to-180 nm.

7. The liquid crystal display panel according to claim 1, wherein the second optical compensation layer has a thickness direction retardation R _th Is any one of-60 nm, -64nm, -75nm, -100nm, -110nm, -125nm, -135nm or-150 nm.

8. The liquid crystal display panel according to claim 1, wherein the first optical compensation is an optical compensation film layer based on liquid crystal molecule coating or an optical compensation film layer based on a stretched polymer film;

the second optical compensation layer is an optical compensation film layer based on liquid crystal molecule coating or an optical compensation film layer based on a stretched polymer film.

9. The liquid crystal display panel of claim 1, wherein the third optical compensation layer is a +a compensation film layer.

10. The liquid crystal display panel according to claim 1, wherein the first optical compensation layer is disposed on a side of the first or second substrate away from the liquid crystal layer.

11. The liquid crystal display panel of claim 10, wherein the second optical compensation layer is disposed on a side of the first optical compensation layer away from the liquid crystal layer; or,

the second optical compensation layer is arranged between the first substrate base plate and the second substrate base plate; or,

the second optical compensation layer is arranged between the first substrate base plate and the first optical compensation layer; or,

the second optical compensation layer is disposed between the second substrate and the first optical compensation layer.

12. The liquid crystal display panel of claim 10, wherein the third optical compensation layer has an in-plane retardation R _O2 In-plane retardation R with the liquid crystal layer _OLC The sum is equal to a positive integer multiple of the first wavelength; wherein the first wavelength range is 535nm + -50 nm.

13. The liquid crystal display panel of claim 12, wherein the third optical compensation layer has an in-plane retardation R _O2 Is 160 nm-240 nm; in-plane retardation R of the liquid crystal layer _OLC Is 350 nm.+ -.25 nm.

14. The liquid crystal display panel of claim 12, wherein the third optical compensation layer has an in-plane retardation R _O2 Is in the range of 1 85nm + -25 nm; in-plane retardation R of the liquid crystal layer _OLC Is 350 nm.+ -.25 nm.

15. The liquid crystal display panel according to claim 1, wherein,

the first polaroid, the first substrate base plate, the liquid crystal layer, the third optical compensation layer, the second substrate base plate, the first optical compensation layer, the second optical compensation layer and the second polaroid are sequentially laminated;

or, the first polarizer, the first substrate, the third optical compensation layer, the liquid crystal layer, the second substrate, the first optical compensation layer, the second optical compensation layer, and the second polarizer are stacked in this order;

or, the first polarizer, the first substrate, the liquid crystal layer, the second optical compensation layer, the third optical compensation layer, the second substrate, the first optical compensation layer and the second polarizer are stacked in order.

16. The liquid crystal display panel of claim 1, wherein the second optical compensation layer is disposed between the first and second substrate substrates; or the second optical compensation layer is arranged on one side of the first substrate or the second substrate far away from the liquid crystal layer.

17. The liquid crystal display panel according to claim 1, wherein,

the liquid crystal layer comprises a first alignment film and a second alignment film which are oppositely arranged, and a first liquid crystal molecular layer positioned between the first alignment film and the second alignment film; the first alignment film is configured to anchor first liquid crystal molecules close to the first alignment film in the first liquid crystal molecule layer, so that a first pretilt angle is generated by the first liquid crystal molecules close to the first alignment film; the second alignment film is configured to anchor the first liquid crystal molecules close to the second alignment film in the first liquid crystal molecule layer, so that the first liquid crystal molecules close to the second alignment film generate a second pretilt angle according to the second pretilt angle; the alignment direction of the first alignment film is the same as the alignment direction of the second alignment film;

the third optical compensation layer comprises a third alignment film and a second liquid crystal molecule layer; the third alignment film is configured to anchor second liquid crystal molecules close to the third alignment film in the second liquid crystal molecule layer, so that a third pretilt angle is generated by the second liquid crystal molecules close to the third alignment film; the orthographic projection of the optical axis of the second liquid crystal molecules of the second liquid crystal molecule layer on the first substrate is parallel to the orthographic projection of the optical axis of the first liquid crystal molecules of the first liquid crystal molecule layer on the first substrate.

18. The liquid crystal display panel of claim 17, wherein a direction of the first pretilt angle is the same as a direction of the second pretilt angle;

the direction of the third pretilt angle is the same as or opposite to the direction of the first pretilt angle.

19. The liquid crystal display panel of claim 17, wherein the direction of the first pretilt angle is opposite to the direction of the second pretilt angle;

the direction of the third pretilt angle is the same as the direction of the first pretilt angle, or the direction of the third pretilt angle is the same as the direction of the second pretilt angle.

20. The liquid crystal display panel according to any one of claims 17 to 19, wherein the first pretilt angle, the second pretilt angle, and the third pretilt angle are equal in magnitude.

21. The liquid crystal display panel according to any one of claims 17 to 19, wherein the first pretilt angle, the second pretilt angle, and the third pretilt angle have a size in a range of 2 ° ± 2 °.

22. The liquid crystal display panel according to any one of claims 17 to 19, wherein the first pretilt angle, the second pretilt angle, and the third pretilt angle range is 2 ° ± 1 °.

23. The liquid crystal display panel according to any one of claims 1 to 19, wherein the first liquid crystal molecules are negative liquid crystal molecules.

24. A display device, comprising:

the liquid crystal display panel of any one of claims 1 to 23; and

the backlight module is arranged on one side of the first polaroid of the liquid crystal display panel, which is far away from the liquid crystal layer of the liquid crystal display panel.

25. The display device according to claim 24, wherein an orthographic projection of an optical axis of a liquid crystal layer of the liquid crystal display panel on the first polarizing plate is perpendicular to a transmission axis of the first polarizing plate;

the first optical compensation layer and the second optical compensation layer of the liquid crystal display panel are respectively arranged on one side of the liquid crystal layer away from the backlight module.

26. The display device according to claim 24, wherein an orthographic projection of an optical axis of a liquid crystal layer of the liquid crystal display panel on the first polarizing plate is parallel to a transmission axis of the first polarizing plate;

the first optical compensation layer and the second optical compensation layer of the liquid crystal display panel are respectively arranged on one side of the liquid crystal layer, which is close to the backlight module.

27. A manufacturing method of a liquid crystal display panel comprises the following steps:

providing a first polarizer and a second polarizer, wherein the transmission axis of the first polarizer is perpendicular to the transmission axis of the second polarizer;

Forming a liquid crystal layer between the first and second polarizers; the liquid crystal layer comprises first liquid crystal molecules, and the orthographic projection of the optical axis of the first liquid crystal molecules on the first polaroid is parallel to the transmission axis of the first polaroid or the transmission axis of the second polaroid;

forming a first optical compensation layer between the first polarizing plate and the liquid crystal layer or between the second polarizing plate and the liquid crystal layer; wherein the orthographic projection of the optical axis of the first optical compensation layer on the first polaroid is perpendicular to the orthographic projection of the optical axis of the first liquid crystal molecule on the first polaroid;

forming a second optical compensation layer between the first optical compensation layer and the liquid crystal layer or on a side of the first optical compensation layer away from the liquid crystal layer; wherein, the optical axis of the second optical compensation layer is vertical to the plane of the second optical compensation layer;

a first substrate is arranged between the first polaroid and the liquid crystal layer, a second substrate is arranged between the second polaroid and the liquid crystal layer, and the manufacturing method further comprises the following steps:

forming a third optical compensation layer between the first substrate and the liquid crystal layer, or between the second substrate and the liquid crystal layer; the orthographic projection of the optical axis of the third optical compensation layer on the first substrate is parallel to the orthographic projection of the optical axis of the liquid crystal molecules of the liquid crystal layer on the first substrate;

the in-plane retardation of the first optical compensation layer is R _O1 The in-plane retardation of the third optical compensation layer is R _O2 The in-plane retardation of the liquid crystal layer is R _OLC ，R _O1 、R _O2 And R is _OLC The following formula is satisfied:

R _O2 －R _O1 +R _OLC ＝nλ；